Erratum: Average energy expended per ion pair in liquid argon

Miyajima, M.; Takahashi, T.; Konno, S.; Hamada, Tomoyo; Kubota, Shinzou; Shibamura, H.; Doke, T.

doi:10.1103/physreva.10.1452

Cited by 29 publications

(11 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From this data it is evident that our HV currents continue to slowly rise for electric fields above E ¼ 22 kV=cm [20] rather than "plateauing" as some suggest. This observation challenges the assumption that the measurement of W¼23.6 eV is at an asymptotic electric field.…”

Section: Discussionmentioning

confidence: 75%

“…In a production simulation we generated n β ¼ 10 000 000 betas. Of these only m We convert the energy deposited in the liquid argon to ionization charge as follows: measurements of the 976 keV monochromatic kinetic energy conversion electron from 207 Bi, ranging out in liquid argon, show the average deposited energy required to create one electron-ion pair as WðE T Þ ¼ 23:6 7 0:3 eV at an electric field of E T ¼ 22 kV=cm [20]. Using the density of liquid argon (1.396 g/cm 3 ) and the ionization energy loss of minimum ionizing betas in the liquid (1.349 MeV/(g/cm 2 )) [21] we find the average number of ionizations is about 8000 per mm of track length at E ¼ E T .…”

Section: Energy Depositmentioning

confidence: 99%

See 1 more Smart Citation

Space-charge effects in liquid argon ionization chambers

Walker

2015

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

a b s t r a c tWe have uniformly irradiated liquid argon ionization chambers with betas from high-activity 90 Sr sources. The radiation environment is similar to that in the liquid argon calorimeters which are part of the ATLAS detector installed at CERN's Large Hadron Collider (LHC). We measured the resulting ionization current over a wide range of applied potential for two different source activities and for three different chamber gaps. These studies provide operating experience at exceptionally high ionization rates. In particular they indicate a stability at the 0.1% level for these calorimeters over years of operation at the full LHC luminosity when operated in the normal mode at an electric field E ¼ 1:0 kV=mm. We can operate these chambers in the normal mode or in the space-charge limited regime and thereby determine the transition point between the two. This transition point is parameterized by a positive argon ion mobility of μ þ ¼ 0:08 7 0:02 mm 2 =V s at a temperature of 88.0 70.5 K and at a pressure of 1.02 70.02 bar. In the space-charge limited regime the ionization currents are degraded and show signs of instability. At the highest electric fields in our study (6.7 kV/ mm) the ionization current is still slowly rising with increasing electric field.

show abstract

Section: Discussionmentioning

confidence: 75%

Section: Energy Depositmentioning

confidence: 99%

Space-charge effects in liquid argon ionization chambers

Walker

2015

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

show abstract

“…Each energy deposition simulated in Geant4 is first apportioned to Ar * 2 excimers (N ex ) and electron-ion pairs (N i ) according to the excitation ratio in LAr, α = N ex /N i = 0.21 [6,8]. The number of ionization electrons surviving recombination (N e ) is determined from the dE/dx of the particle step using one of two parametrized models: the Modified Box Model [20] for dE/dx 1.7 MeV/cm, and the Birks Model [19] for smaller dE/dx where the Modified Box model starts to fail as illustrated in Fig.…”

Section: A Charge and Light Productionmentioning

confidence: 99%

Calorimetry for low-energy electrons using charge and light in liquid argon

Carey

Kearns

2020

Phys. Rev. D

View full text Add to dashboard Cite

Precise calorimetric reconstruction of 5-50 MeV electrons in liquid argon time projection chambers (LArTPCs) will enable the study of astrophysical neutrinos in DUNE and could enhance the physics reach of oscillation analyses. Liquid argon scintillation light has the potential to improve energy reconstruction for low-energy electrons over charge-based measurements alone. Here we demonstrate light-augmented calorimetry for low-energy electrons in a single-phase LArTPC using a sample of Michel electrons from decays of stopping cosmic muons in the LArIAT experiment at Fermilab. Michel electron energy spectra are reconstructed using both a traditional charge-based approach as well as a more holistic approach that incorporates both charge and light. A maximum-likelihood fitter, using LArIAT's well-tuned simulation, is developed for combining these quantities to achieve optimal energy resolution. A sample of isolated electrons is simulated to better determine the energy resolution expected for astrophysical electron-neutrino charged-current interaction final states. In LArIAT, which has very low wire noise and an average light yield of 18 pe/MeV, an energy resolution of σ/E 9.3%/ √ E ⊕ 1.3% is achieved. Samples are then generated with varying wire noise levels and light yields to gauge the impact of light-augmented calorimetry in larger LArTPCs. At a chargereadout signal-to-noise of S/N 30, for example, the energy resolution for electrons below 40 MeV is improved by ≈ 10%, ≈ 20%, and ≈ 40% over charge-only calorimetry for average light yields of

show abstract

“…The data in (a) and (b) are fit simultaneously with the intercepts free and the slopes taken as a common parameter. E/N i , where E is the energy of the recoil) is determined to be 23.6±0.3 eV in LAr using internal conversion electrons emitted from 207 Bi [45]. The inherent S1-S2 anticorrelation in the recombination model can now be expressed as…”

Section: Anticorrelation Between S1 and S2mentioning

confidence: 99%

Measurement of scintillation and ionization yield and scintillation pulse shape from nuclear recoils in liquid argon

Cao¹,

Alexander²,

Aprahamian³

et al. 2015

Phys. Rev. D

128

190

View full text Add to dashboard Cite

We have measured the scintillation and ionization yield of recoiling nuclei in liquid argon as a function of applied electric field by exposing a dual-phase liquid argon time projection chamber (LAr-TPC) to a low energy pulsed narrow band neutron beam produced at the Notre Dame Institute for Structure and Nuclear Astrophysics. Liquid scintillation counters were arranged to detect and identify neutrons scattered in the TPC and to select the energy of the recoiling nuclei. We report measurements of the scintillation yields for nuclear recoils with energies from 10.3 to 57.3Â keV and for median applied electric fields from 0 to 970 V/cm. For the ionization yields, we report measurements from 16.9 to 57.3 keV and for electric fields from 96.4 to 486 V/cm. We also report the observation of an anticorrelation between scintillation and ionization from nuclear recoils, which is similar to the anticorrelation between scintillation and ionization from electron recoils. Assuming that the energy loss partitions into excitons and ion pairs from Kr83m internal conversion electrons is comparable to that from Bi207 conversion electrons, we obtained the numbers of excitons (Nex) and ion pairs (Ni) and their ratio (Nex/Ni) produced by nuclear recoils from 16.9 to 57.3 keV. Motivated by arguments suggesting direction sensitivity in LAr-TPC signals due to columnar recombination, a comparison of the light and charge yield of recoils parallel and perpendicular to the applied electric field is presented for the first time. © 2015 American Physical Society

show abstract

Erratum: Average energy expended per ion pair in liquid argon

Cited by 29 publications

References 0 publications

Space-charge effects in liquid argon ionization chambers

Space-charge effects in liquid argon ionization chambers

Calorimetry for low-energy electrons using charge and light in liquid argon

Measurement of scintillation and ionization yield and scintillation pulse shape from nuclear recoils in liquid argon

Contact Info

Product

Resources

About